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Estivation Studies of the Convergent Lady Beetle in Arkansas1

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Abstract:

An investigation was made to determine whether summer estivation of the convergent lady beetle, Hippodamia convergens Guerin-Meneville, occurs in Arkansas. Results showed that, beginning in June, the convergent lady beetle populations in cultivated crops dropped very sharply. The beetles remaining in most fields were sexually inactive, with undeveloped ovaries and a low rate of oxygen consumption. Aggregations of convergent lady beetles began to appear on Pinnacle and Sugarloaf Mountains from the first to the last week in June. Beetles collected on mountain tops had undeveloped ovaries, and their oxygen-consumption rate was low. Aggregations formed about June 3, 1965, on Pinnacle Mountain remained intact until February 1966. In 1966, for some unexplained reason, aggregations formed about June 28 disappeared in September of that year. Estivation appeared to be facultative and associated with low prey populations. When aphids were abundant, as in early spring and fall, the beetles tended to be sexually active and showed a high rate of oxygen consumption.

Document Type: Research Article

Publication date: December 1, 1967

More about this publication?
  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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